Condensed

using System;
using System.Linq;

namespace simonEpedal
{
    class Program
    {
        public static void Main(string[] args)
        {
            int[] array = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();

            for (int sumElement = 0; sumElement < array.Length - 1; sumElement++)
            {
                for (int currentElement = 0; currentElement < array.Length - 1; currentElement++)
                {
                    array[currentElement] = array[currentElement] + array[currentElement + 1];
                }
            }

            Console.WriteLine(array[0]);
        }
    }
}